Method of forming cast-on end stops for separable fastener stringers



March g, 1949. L MQRIN 2,464,056

METHOD OF FORMING CAST-ON END STOPS FOR SEPARABLE FASTENER STRINGERSFiled Oct. 16, 1945 IN VENT OR 100/5 6; Mam/v A TT ORNE Y Patented Mar.8, 1949 METHOD OF FORMING CAST-ON END STOPS FOR SEPARABLE FASTENERSTRINGERS Louis H. Morin, Bronx, N. Y.

Application October 16, 1943, Serial No. 506,466

2 Claims.

This invention relates to the formation of various kinds of end stops onthe ends of the stringers of separable fasteners to limit or checkmovement of a slider on the stringers. More particularly, the inventiondeals with the method of forming end stops on fastener stringers toinsure proper positioning and alinement of the stops on the beaded edgeof the stringers, and further to provide cast-on end stops having meansfor keying the same against shifting movement longitudinally of thestringer tapes. The novel features of the invention will be bestunderstood from the following description when taken together with theaccompanying drawing, in Which certain embodiments of the invention aredisclosed, and in which the separate parts are designated by suitablereference characters in each of the views; and in which:

Fig. 1 is a plan view of what is commonly termed a box and pin end stopcoupling showing one adaptation of the invention.

Fig. 2 is a plan view of the pin portion of the stop shown in Fig. ldetached.

Fig. 3 is a partial section on the line 3-3 of Fig. 2 on an enlargedscale.

Fi 4 is a diagrammatic sectional View showing the dies employed informing stops of the kind under consideration; and

Fig. 5 is a perspective view of another form of end stop showing anotheradaptation of the invention.

In the construction of fasteners of the kind under consideration, andparticularly in the mounting of end stops on the ends of the stringersadjacent end links thereon, difliculty has been experienced in diecasting stops of this kind directly upon the beaded edges of thestringer tapes primarily from the standpoint of properly alining andpositioning the stops on the tape ends.

As a solution to this problem, I employ a method which comprisesforming, in the dies employed to produce the particular stop on thestringer end, two or more projecting members arranged in opposedrelationship to each other in the dies, so as to form what might betermed a pair of gripping jaws which are so positioned as to firmly gripthe bead of the tape to support the same in proper position, as well asin proper alinement, with respect to the die cavity, to insure theaccurate arrangement of the beaded edge in the resulting casting notonly from a standpoint of alinement, but also from a standpoint ofcentralization. This method of procedure provides an even distributionof the casting material around the beaded edge, and maintenance of 2proper lo-ngitu dinal alinement, which latter result is accomplished byspacing pairs of the gripping jaws longitudinally of the dies, so as toengage the head of the tape at longitudinally spaced intervals.

The pairs of jaws form in the resulting casting spaced apertures whichexpose the bead of the tape therethrough, and the bead of the tapeexpands into these apertures to form means key ing the castings againstmovement on the stringer tape, and particularly in a directionlongitudinal- 1y thereof.

It will be understood that the invention is generally applicable tocastings of the kind under consideration formed on the stringer tape orother mounting member, and for purposes of illustrating certainadaptations of the invention the same has been illustrated as applied tocertain types and kinds of end stops, for example, in one instance tothe pin and box parts of one type of stop, and to the bar member ofanother type of stop.

In Fig. 1 of the drawing is shown one end portion of two stringers H!and H. To the beaded edge [2 of one stringer is attached the box part [3of a detachable end stop coupling, and to the bead 14 of the otherstringer is attached the pin part Hi. The pin part [5 fits in a socketof the box part in coupling said parts together, and as in other devicesof this kind, the pin part is separable from the box part usuallythrough the slider when brought in position abutting the shoulder it onthe box part [3;

The box part 13 includes a projecting pin or bar portion ll, and thispin or bar portion has spaced apertures 18 registering with two of agroup of four corresponding apertures IS in the pin part [5.

The pin part it: including its associated stringer ll, is shown detachedin Fig, 2 of the drawing, and this pin part includes at its outer edge alongitudinal projection 20 which abuts the pin portion I! of the boxpart l3, and the inner end of the projection 26 has a link or scoopengaging part 2| adapted to engage the end link or scoop 22 of thestringer It), as in other devices of this type and kind.

In Fig. 3 of the drawing is shown an enlarged crass sectional viewthrough the pin part l5 and part of the stringer tape l l in order toillustrate the slight extension of the beaded edge l4 into the aperturesl9, as at 23, these extensions or projections forming key like memberswhich aid in retaining the castings against displacement from thestringer tapes, and particularly against movement longitudinally withrespect thereto.

The members or parts l3, l5 are formed as die castings directly upon thebeaded edge portions of the stringer tapes. In forming them of castmaterials, whether metallic or plastic, a certain amount of the castmaterial will extend into the interstices of the braid of the tape toestablish anchorage. However, in the plastic materials the degree ofthis fiow of material is limited, as compared with cast metals, and itis particularly in such instances that the key members 23 are ofimportance.

In Fig. 5 of the drawing, another form of stop is illustrated at 24.This stop is in the form of an elongated bar arranged along the beadededge 25 of a stringer tape 26, preferably at what is commonly referredto as the upper end or an end opposite to the ends illustrated in Fig.1,

which are commonly referred to as bottom stops. h

This is particularly true in such uses of the fasteners as would beapplied to wind breakers and similar jacket type of garments.

The bar stop 24 has enlarged end portions 21 and 28, the latter having acurvature so as to facilitate detachment of a slider to provideseparation of the stringers at the upper end thereof. The use of suchdevices is now known, and from this standpoint, further detailedreference will not be made in this application.

Between the enlarged ends 21 and 28 the central portion of the bar 29 isrelatively thin, and spaced longitudinally thereof are apertures 39,which are rectangular in cross sectional form rather than being round,as seen in Figs. 1 and 2 of the drawing. At this time, it is well topoint out that the particular contour of the apertures or openings maybe varied to suit difierent types and kinds of castings.

In Fig. 4 of the drawing is diagrammatically illustrated dies which maybe used in forming any one of the castings, for example, the box partl3, the pin part I5, or the bar 24. The section in any such case,however, would be a section taken through the pin portion ll of the boxpart l3, the smaller end of the pin part [5, or for example, on the line33 of Fig. 2, or through one of the apertures 30 on the reduced centralportion 29 of the bar 24. In that the section of Fig. 4 is applicable toany of the three devices above mentioned, the part of the tape on whichthe casting is to be formed will be designated by the reference numeral3|, and 32 will represent the bead of the tape, 33 is one die part, and34 the other die part. Each die part has a cavity or impression 35, 36respectivelyjwhich collectively form around the beaded edge 32 of thetape a casting, as at 31. At 38 is illustrated a gate passage foradmission of the casting material to the cavities along the parting lineof the dies 33, 34.

Arranged upon directly opposed walls of the cavities or impressions 35,36 are inwardly projecting grippers or jaw members 39 and 40,.

which are adapted to imbed themselves into the bead 32 of the'tape, asindicated at 4|, when the dies 33, 34 are brought into engagement witheach other.

As a matter of fact, in the operation of closing the dies, the grippersor jaw members 39 will first engage the bead 32 of the tape before thedies otherwise engage the tape, so that the tape becomes definitelycentralized and positioned within and between the dies. In longcastings, and where it is possible to do so. a numher of the pairs ofgrippers or jaw members will be provided, and this is particularlydesirable where thin wall structures are formed on the castings, so thatthe bead will be centralized within the thin wall structure of thecastings, for example, as in the reduced pin extension I! of the boxpart 13, throughout the full length of the pin part l5 and on thereduced portion 29 of the bar 24.

The inner surfaces of the jaw members will be rounded, so as to in noway injure the bead of the tape, and when the dies are separated afterthe casting has been formed, the bead will have a tendency to expanditself into the apertures 42 in the manner illustrated in Fig. 3 of thedrawing in forming key members similar to the key members 23. It will beunderstood that in addition to the action of the jaw members upon thebead, the formation of the casting also places the bead under a certainamount of compression, and the apertures formed by the jaw members, suchas the members 39, 40, allows the bead to expand to the extent offorming the key members referred to.

Above reference is made to the initial engagement of the jaw members 39,40 with the beaded edge of the tape. In other words, the beaded edge issubstantially round, and it will appear from a consideration of Fig. 4of the drawing that as the dies are moved into closed position, the jawmembers will first engage the bead before any other part of the tape isengaged by the dies, or before adjacent abutting surfaces of the diesare brought into engagement with each other. This firm and initialengagement with the bead prevents any possible lateral shifting of thetape within the dies, and thus maintains in the resulting casting aproper alinement of the head in the casting in addition tocentralization of the bead within the cavity or impression of the dies.

Die castings formed on mounting members in accordance with the methoddefined, will produce the strongest possible coupling of the castingswith the mounting member, as well as to insure the longest life wear ofthe castings by equally distributing the material round the mounting.

However, in cases where a distortion or ofisetting of the mounting isdesirable within a casting, this can be accomplished by using one jawmember which is longer than the other. Where several pairs of jawmembers are employed, as for example, in the pin part l5 of Fig. 2,alternate upper and lower jaws may be made longer, so that the tapewould actually have a snake like curvature, or in other words, hill anddale arrangement throughout the length of the casting, even though theupper and lower surfaces of the casting would be flat throughout thelength thereof. In other instances, the offsetting of the jaw memberswould be desirable in conforming the mounting when composed of flexiblematerial to the contour of a casting having irregular outer surfaces.

Having fully described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. The method of casting an elongated end member on a fabric stringertape having a resilient bead thereon and coincidently keying said memberagainst movement thereon which comprises moving a pair of dies toward apredetermined section of the bead to receive said section within thecavities of the dies,-said die cavities in mating position defining saidmember, gripthe bead, injecting casting material man a cavities of theclosed dies, and opening the: dies, after said member has been cast onthe bead, thereby forming a cast member having aperturescorresponding tosaid jaws and into which the said portions of the bead tend to expand tokey the tape to the member.

2. The method of casting an elongated end member on a mounting having abeaded, resilient edge and coincidently keying said member againstmovement thereon which comprises mov} ing a pair of dies toward apredetermined .section of said beaded edge to receive said sectionwithin the cavities of the dies, said die cavities in mating positiondefining said memberhgripping portions of the beaded edge before thedies are fully closed about the same by means of: positioned in thecavity of each die, fullyhclosing the dies about said beaded edge,thereby pressing the jaws against and depressing the surfaces of saidportions of the beaded edge, injecting casting material into thecavities of the closed dies, and opening the dies after said member hasbeen cast on the beaded edge, thereby forming a cast member havingapertures corresponding to said jaws and into which the said portions ofthe beaded edge tend to expand to key the mounting to the member.

LOUIS H. MORIN.

REFERENCES CITED The following references are of record in the file ofthis patent: l

UNITED STATES PATENTS Number Name Date 742,074 Seibel Oct. 20, 19031,813,434 Bennett July 7, 1931 2,005,872 Rocke June 25, 1935 2,137,814Skora Nov. 22, 1938 2,197,465 Brunetti Apr. 16, 1940 2,256,769 AmrineSept. 23, 1941 2,261,534 Voity Nov. 4, 1941 2,274,722 Marinsky Mar. 3,1942 2,289,586 Marinsky July 14, 1942 OTHER REFERENCES Chapuis APC391,198 June 15, 1943.

